Duplicate enom domains

[battles]

We've set up the ENOM api connection and mostly all is going well.

 

Except occasionally I see there's a couple "Pending Module Actions" on our WHMCS dashboard and in that sections there's always a failure:

Enom/ RenewDomain There is already an open order for this domain.

 

When I go to that client's info. I see 2 of the same domain in their "domains" section.

 

How might I correct this?

 

TIA!